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File: [cvs.NetBSD.org] / src / lib / libc / db / recno / rec_get.c (download)

Revision 1.16, Thu Sep 11 12:58:00 2008 UTC (15 years, 6 months ago) by joerg
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, wrstuden-revivesa-base-3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, matt-premerge-20091211, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-premerge-20101231, matt-mips64-base2, jym-xensuspend-nbase, jym-xensuspend-base, jym-xensuspend, christos-time_t-nbase, christos-time_t-base, cherry-xenmp-base, cherry-xenmp, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver
Branch point for: yamt-pagecache, tls-maxphys, christos-time_t
Changes since 1.15: +6 -2 lines

Consistently include "nbtool_config.h" when cross-compiling.

/*	$NetBSD: rec_get.c,v 1.16 2008/09/11 12:58:00 joerg Exp $	*/

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: rec_get.c,v 1.16 2008/09/11 12:58:00 joerg Exp $");

#include "namespace.h"
#include <sys/types.h>

#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <db.h>
#include "recno.h"

/*
 * __REC_GET -- Get a record from the btree.
 *
 * Parameters:
 *	dbp:	pointer to access method
 *	key:	key to find
 *	data:	data to return
 *	flag:	currently unused
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
 */
int
__rec_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
{
	BTREE *t;
	EPG *e;
	recno_t nrec;
	int status;

	t = dbp->internal;

	/* Toss any page pinned across calls. */
	if (t->bt_pinned != NULL) {
		mpool_put(t->bt_mp, t->bt_pinned, 0);
		t->bt_pinned = NULL;
	}

	/* Get currently doesn't take any flags, and keys of 0 are illegal. */
	if (flags || (nrec = *(recno_t *)key->data) == 0) {
		errno = EINVAL;
		return (RET_ERROR);
	}

	/*
	 * If we haven't seen this record yet, try to find it in the
	 * original file.
	 */
	if (nrec > t->bt_nrecs) {
		if (F_ISSET(t, R_EOF | R_INMEM))
			return (RET_SPECIAL);
		if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
			return (status);
	}

	--nrec;
	if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
		return (RET_ERROR);

	status = __rec_ret(t, e, 0, NULL, data);
	if (F_ISSET(t, B_DB_LOCK))
		mpool_put(t->bt_mp, e->page, 0);
	else
		t->bt_pinned = e->page;
	return (status);
}

/*
 * __REC_FPIPE -- Get fixed length records from a pipe.
 *
 * Parameters:
 *	t:	tree
 *	cnt:	records to read
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
int
__rec_fpipe(BTREE *t, recno_t top)
{
	DBT data;
	recno_t nrec;
	size_t len;
	int ch;
	uint8_t *p;

	if (t->bt_rdata.size < t->bt_reclen) {
		t->bt_rdata.data = t->bt_rdata.data == NULL ?
		    malloc(t->bt_reclen) :
		    realloc(t->bt_rdata.data, t->bt_reclen);
		if (t->bt_rdata.data == NULL)
			return (RET_ERROR);
		t->bt_rdata.size = t->bt_reclen;
	}
	data.data = t->bt_rdata.data;
	data.size = t->bt_reclen;

	for (nrec = t->bt_nrecs; nrec < top;) {
		len = t->bt_reclen;
		for (p = t->bt_rdata.data;; *p++ = ch)
			if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
				if (ch != EOF)
					*p = ch;
				if (len != 0)
					memset(p, t->bt_bval, len);
				if (__rec_iput(t,
				    nrec, &data, 0) != RET_SUCCESS)
					return (RET_ERROR);
				++nrec;
				break;
			}
		if (ch == EOF)
			break;
	}
	if (nrec < top) {
		F_SET(t, R_EOF);
		return (RET_SPECIAL);
	}
	return (RET_SUCCESS);
}

/*
 * __REC_VPIPE -- Get variable length records from a pipe.
 *
 * Parameters:
 *	t:	tree
 *	cnt:	records to read
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
int
__rec_vpipe(BTREE *t, recno_t top)
{
	DBT data;
	recno_t nrec;
	ptrdiff_t len;
	size_t sz;
	int bval, ch;
	uint8_t *p;

	bval = t->bt_bval;
	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
		for (p = t->bt_rdata.data,
		    sz = t->bt_rdata.size;; *p++ = ch, --sz) {
			if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
				data.data = t->bt_rdata.data;
				data.size = p - (uint8_t *)t->bt_rdata.data;
				if (ch == EOF && data.size == 0)
					break;
				if (__rec_iput(t, nrec, &data, 0)
				    != RET_SUCCESS)
					return (RET_ERROR);
				break;
			}
			if (sz == 0) {
				len = p - (uint8_t *)t->bt_rdata.data;
				t->bt_rdata.size += (sz = 256);
				t->bt_rdata.data = t->bt_rdata.data == NULL ?
				    malloc(t->bt_rdata.size) :
				    realloc(t->bt_rdata.data, t->bt_rdata.size);
				if (t->bt_rdata.data == NULL)
					return (RET_ERROR);
				p = (uint8_t *)t->bt_rdata.data + len;
			}
		}
		if (ch == EOF)
			break;
	}
	if (nrec < top) {
		F_SET(t, R_EOF);
		return (RET_SPECIAL);
	}
	return (RET_SUCCESS);
}

/*
 * __REC_FMAP -- Get fixed length records from a file.
 *
 * Parameters:
 *	t:	tree
 *	cnt:	records to read
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
int
__rec_fmap(BTREE *t, recno_t top)
{
	DBT data;
	recno_t nrec;
	uint8_t *sp, *ep, *p;
	size_t len;

	if (t->bt_rdata.size < t->bt_reclen) {
		t->bt_rdata.data = t->bt_rdata.data == NULL ?
		    malloc(t->bt_reclen) :
		    realloc(t->bt_rdata.data, t->bt_reclen);
		if (t->bt_rdata.data == NULL)
			return (RET_ERROR);
		t->bt_rdata.size = t->bt_reclen;
	}
	data.data = t->bt_rdata.data;
	data.size = t->bt_reclen;

	sp = (uint8_t *)t->bt_cmap;
	ep = (uint8_t *)t->bt_emap;
	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
		if (sp >= ep) {
			F_SET(t, R_EOF);
			return (RET_SPECIAL);
		}
		len = t->bt_reclen;
		for (p = t->bt_rdata.data;
		    sp < ep && len > 0; *p++ = *sp++, --len);
		if (len != 0)
			memset(p, t->bt_bval, len);
		if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
			return (RET_ERROR);
	}
	t->bt_cmap = (caddr_t)sp;
	return (RET_SUCCESS);
}

/*
 * __REC_VMAP -- Get variable length records from a file.
 *
 * Parameters:
 *	t:	tree
 *	cnt:	records to read
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
int
__rec_vmap(BTREE *t, recno_t top)
{
	DBT data;
	uint8_t *sp, *ep;
	recno_t nrec;
	int bval;

	sp = (uint8_t *)t->bt_cmap;
	ep = (uint8_t *)t->bt_emap;
	bval = t->bt_bval;

	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
		if (sp >= ep) {
			F_SET(t, R_EOF);
			return (RET_SPECIAL);
		}
		for (data.data = sp; sp < ep && *sp != bval; ++sp);
		data.size = sp - (uint8_t *)data.data;
		if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
			return (RET_ERROR);
		++sp;
	}
	t->bt_cmap = (caddr_t)sp;
	return (RET_SUCCESS);
}